The three main titles are set in Placidia Sans, Normal and Display, respectively. Burdigala X Sans is used for the subtitles in example one and two. In stead of Burdigala X Sans, we could have opted for Placidia Sans. However, using fonts from the same family may sometimes be too much of a good thing, in that they are too similar, as the case may be.
In other words; Burdigala X Sans is similar in style, but different enought to create a subtle dynamic between the main title and subtitle. It depends on the total message, and travel certainly is about movement. It is dynamic.
Display + Sans
In the third and last example we have a bold Placidia Display with Placidia Sans in the subtitle. This works just fine, since Placidia Display is quite different in style. Burdigala X Sans would also work well here, but Placidia Sans has a slightly softer look and feel, which harmonizes perfectly with the Display version.
/ap